Canon EOS 7 - AF Sensor Dust Check

1.13 AF SENSOR DUST CHECK
PURPOSE:
To check the AF sensor output waveform (image data output).This waveform can show
if there is any dirt in the AF sensor light path.
TOOLS
:
EF-8000/5000
CHECK
PROCEDURE:
1) Position the camera at the light source with a lens mounted to it. Set the brightness
of the light source to LV12. (Be sure to shield the eyepiece from external light.)
Fig. 4-12 AF Sensor Dust Check
Part 4: Electrical Adjustment
4-25
Shield from light.
Light
source